<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>

        /*通配符*/
        *{
            padding:0px;
            margin:0px;
        }

      /*  body,div,p,ul,li,h1,h2,h3{
            margin:0px;
            padding:0px;
        }
*/
        div{
            width:100px;
            height: 100px;
            border:1px solid red;
        }
        p{
            width:100px;
            height: 100px;
            border:1px solid blue;

        }
    </style>
</head>
<body>
    <div ></div>
    <p></p>
    <p></p>
</body>
</html>